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Molecular Dynamics Simulation of the Dynamic Behavior of Nanoresonators

Afsharmanesh, Bahram | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46822 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Nejat Pishkenari, Hossein
  7. Abstract:
  8. In this project, the equilibrium structure of clamped-free silicon nano-beams is investigated using molecular dynamics (MD) simulations. Four main interatomic potentials for silicon nanostructures, i.e. Tersoff, MEAM, Stillinger-Weber and EDIP, are implemented in the current study. Using aforementioned potentials, the structural stability of Si nano-beams are studied and effects of thickness, width, length, size, lattice direction, facets of cross section, and temperature on the equilibrium structure of nano-beams are investigated. The conducted simulations demonstrate that equilibrium structure of nano-beam is completely dependent on the type of atomic potential used for modeling. Furthermore, vibrational characteristics of pure crystalline silicon nanowires/nanobeams along [001], [110] and [111] directions for different edge conditions are investigated by molecular dynamics technique with the use of the EDIP/SW potentials. Along this line, numerical data are presented for the fundamental natural frequency as a function of dimensions for clamped-clamped, and clamped-free boundary conditions. Moreover, the effects of lattice directions on the natural frequency of silicon nanowire are studied. Finally we compared these results of moplecular dynamics simulation with those from the classical beam theories by considering surface effects
  9. Keywords:
  10. Molecular Dynamics ; Nanowire ; Vibration ; Size Effect ; Natural Frequency ; Nanoelectromechanical Syestem (NEMS) ; Nanoresonator

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